Heavy Duty Balanced Opposed Compressors - Ariel Corporation

For Models: JGH:E:K:T Appendix B - Clearances
TABLE B-4 Piston-Bore Clearances & Piston Ring/Rider Ring End Gaps for H:E:ET Class Cylinders, in. (mm)
Piston - Bore Clearance Conventional
Bore Diameter Conventional
Piston Rings
Piston/Rider
Rings
Piston Ring End Gap
b
New Maximum
4.25 (108)
0.011 - 0.016
(.028 - 0.41)
0.051 - 0.075
(1.30 - 1.91)
0.225 (5.72)
4.625 (117)
0.012 - 0.017
0.056 - 0.080
(1.42 - 2.03)
0.240 (6.10)
5.125 (130)
(0.30 - 0.43)
0.061 - 0.085
(1.55 - 2.16)
0.255 (6.48)
5.5 (140)
0.013 - 0.018
0.066 - 0.090
(1.68 - 2.29)
0.270 (6.86)
6.0 (152)
(0.33 - 0.46)
0.072 - 0.112
(1.83 - 2.84)
0.336 (8.53)
6.375 (162)
0.014 - 0.019
(0.36 - 0.48)
0.077 - 0.117
(1.96 - 2.97)
0.351 (8.92)
7.0 (178)
0.015 - 0.020
0.084 - 0.124
(2.13 - 3.15)
0.372 (9.45)
7.375 (187)
(0.38 - 0.51)
0.090 - 0.096
0.089 - 0.129
(2.26 - 3.28)
0.387 (9.83)
8.0 (203)
0.016 - 0.022
(0.41 - 0.56)
(2.29 - 2.44) 0.096 - 0.136
(2.44 - 3.45)
0.408 (10.36)
8.375 (213)
0.017 - 0.023
(0.43 - 0.58)
0.101 - 0.141
(2.57 - 3.58)
0.423 (10.74)
9.25 (235)
0.019 - 0.025
(0.48 - 0.64)
0.111 - 0.151
(2.82 - 3.84)
0.453 (11.51)
9.75 (248)
0.020 - 0.026
(0.51 - 0.66)
0.117 - 0.157
(2.97 - 3.99)
0.471 (11.96)
11 (279)
0.022 - 0.028
(0.56 - 0.71)
0.131 - 0.179
(3.33 - 4.55)
0.537 (13.64)
11.5 (292)
0.023 - 0.029
(0.58 - 0.74)
0.138 - 0.186
(3.51 - 4.72)
0.558 (14.17)
13 (330)
0.026 - 0.032
(0.66 - 0.81)
0.156 - 0.204
(3.96 - 5.18)
0.612 (15.54)
13.5 (343)
0.027 - 0.033
(0.69 - 0.84)
0.162 - 0.210
(4.11 - 5.33)
0.630 (16.00)
15.250 (387)
0.030 - 0.037
(0.76 - 0.94)
0.183 - 0.231
(4.65 - 5.87)
0.693 (17.60)
15.75 (400)
0.031 - 0.038
(0.79 - 0.97) 0.090 - 0.097
0.189 - 0.237
(4.80 - 6.02)
0.711 (18.06)
16.75 (425)
0.033 - 0.040
(0.84 - 1.02)
(2.29 - 2.46) 0.201 - 0.251
(5.11 - 6.38)
0.753 (19.13)
17.25 (438)
0.034 - 0.041
(0.86 - 1.04)
0.207 - 0.259
(5.26 - 6.58)
0.777 (19.74)
19 (483)
0.038 - 0.046
(0.97 - 1.17) 0.090 - 0.098
0.228 - 0.292
(5.79 - 7.42)
0.876 (22.25)
19.5 (495)
0.039 - 0.047
(0.99 - 1.19)
(2.29 - 2.49) 0.234 - 0.298
(5.94 - 7.57)
0.894 (22.71)
22.5 (572) Uses Wearbands - See Table B-5.
Piston/Rider Ring
End Gap a
0.050 - 0.066
(1.27 - 1.68)
0.056 - 0.072
(1.42 - 1.83)
0.062 - 0.078
(1.57 - 1.98)
0.068 - 0.084
(1.73 - 2.13)
0.074 - 0.090
(1.88 - 2.29)
0.073 - 0.103
(1.85 - 2.62)
0.091 - 0.121
(2.31 - 3.07)
0.097 - 0.127
(2.46 - 3.23)
0.095 - 0.125
(2.41 - 3.18)
0.100 - 0.130
(2.54 - 3.30)
0.112 - 0.142
(2.84 - 3.61)
0.119 - 0.149
(3.02 - 3.78)
0.136 - 0.166
(3.45 - 4.22)
0.143 - 0.173
(3.63 - 4.39)
0.182 - 0.212
(4.62 - 5.38)
0.190 - 0.220
(4.83 - 5.59)
0.216 - 0.246
(5.49 - 6.25)
0.224 - 0.254
(5.69 - 6.45)
0.239 - 0.269
(6.07 - 6.83)
0.247 - 0.277
(6.27 - 7.04)
0.273 - 0.303
(6.93 - 7.70)
0.281 - 0.311
(7.14 - 7.90)
a. Piston/rider ring radial projection is 0.026 - 0.033 (0.66 - 0.84) and side clearance is 0.008 - 0.013 (0.20 - 0.33).
b. Piston/rider rings are standard on all ET & all E Class cylinders except the 22.5 (572). Conventional piston rings are
standard on H Class cylinders and piston/rider rings optional on bore diameters of 4.25 to 11.5 (108 to 292) with the
exception of bore diameters 4.625 (117), 5.5 (140), 6.375 (162). Piston/rider rings are standard on H Class cylinders
with bore diameters of 4.625 (117), 5.5 (140), 6.375 (162), and 13 to 19.5 (330 to 495). H & E Class Cylinders are outof-production;
use them only if they meet application requirements. Consult your packager and/or Ariel when re-applying
cylinders.
3/11 PAGE B-3